Continuous diaphragm sign is seen when The entire diaphragm is visualized from one side to the other because air in the mediastinum outlines the central portion which is usually obscured by the heart and mediastinal soft tissue structures that are in contact with the diaphragm.
Also;continuous diaphragm sign of pneumoperitoneum
One of the manifestation of massive pneumoperitoneum is the continuous diaphragm sign. Where there is sufficient air beneath the diaphragm, the continuous nature of the diaphragm is demonstrated. Note that the left and right hemidiaphragms contrasted by the free gas appear as a continuous structure.
continuous diaphragm sign of pneumoperitoneum